Abstract
Issues concerned with extensionality and intensionality have been a cardinal motivation behind the development of important semantical theories. A linguistic context is said to be extensional if its expressions can be substituted with expressions that have the same denotation (reference) without altering the truth value of the context. A non-extensional context is said to be intensional. Frege's theory of sense and denotation is reviewed as a motivation for and explanation of the distinction between extensionality and intensionality. In the last section, the distinction is applied to formal languages.
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